Stoker structure



H. E. LIPPERT 2,022,996

1935 STOKER STRUCTURE Original Filed Jun 20, 1951 INVENTOE Patented Dec.3, 1935 UNITED STATES PATENT OFFIQE STOKER STRUCTURE Henry E. Lippert,

Pittsburgh, Pa., mesne assignments, to

assignor, by The Standard Stoker Company, Incorporated, a corporation ofDelaware 2 Claims. (Cl. 110101) This invention relates to locomotivestokers of the scatterfeed type in which fuel is conveyed and pertainsparticularly to the locomotive unit or conduit thereof in which the fuelis delivered through the lower portion of a common hand and stokerfiring opening.

The principal object of the invention is to provide a stoker structurehaving a fan shaped transverse series of fluid nozzles positioned in thefirebox at or forward of the inside sheet of the locomotive backhead todischarge fuel to the areas of ing opening. nozzles positioned in thefirebox to discharge fuel to the areas of. the firebed to which thenozzles are directed, provide a stoker conduit construction that has theadvantages of a stoker which conveys fuel directly to the nozzlesthrough the lower portion of a common hand and stoker firing opening,and maintain decreased vertical and lateral dimensions of the firingopening.

To this end, the invention consists in the parts and arrangement ofparts as hereinafter described and illustrated in the accompanyingdrawing, in which Fig. 1 is a fragmentary vertical longitudinalsectional view of the rear portion of a locomotive, showing theinvention as applied thereto, the invention being partly in section.

Fig. 2 is a horizontal sectional view of the structure shown in Fig. 1,taken on line 22 thereof.

Fig. 4 is a detail vertical sectional view taken on line 4-4 of Fig.

Fig. 5 is a sectional view taken on line 5-5 of Fig. 1, illustrating theshape of the stoker conduit at that point.

Fig. 6 is a sectional view taken on line 6-6 of. Fig. 1, illustratingthe shape of the stoker conduit at that point.

Referring to the drawing, the numeral I designates the firebox; H, theback wall or backhead of the firebox having an opening l2 therein forstoker and hand firing; I3, the krates; M, the mudring; I 5, the cab;IS, the cab deck; and I7, the locomotive frame.

The preferred embodiment of the invention is as follows:

A conduit 23 extends from beneath the deck l6 to the lower portion ofthe firing opening l2, and

The conduit 23 comprises a riser portion 24 and a delivery spout 25,which are secured rigidly together by studs 26 (Fig. 3). The risersection 24 is inclined forwardly and upwardly, from beneath the rear ofthe cab deck and the rear of the locomotive frame, through the deck 10at an angle from the horizontal preferably less than 45; and contains anelevating screw conveyor 21 therein. The elevating screw 21 is supportedon the bottom surface of the riser section 24, extends throughout theentire length of the riser section 24 and projects into the rear end ofthe delivery spout 25; and its upper end terminates at or above theelevation of the lower margin 28 of the firing opening and adjacentthereto. The diameter of the elevating screw 21 decreases toward itsdischarge end, and the vertical height of the riser section 24 conformsto the shape of the elevating screw. The riser section 24 issubstantially circular in cross-sectional shape.

The delivery spout 25 assumes the general form of an upwardly inclined,forwardly projecting and downwardly extending conduit, which opensforwardly in the firing opening. The bo tom wall of this delivery spout25 is inclined from the horizontal at an angle somewhat in excess of theangle of inclination of the riser conduit 24.

It is inclined upwardly rearward of the backhead, projects forwardlythrough the lower portion of the firing opening and extends downwardlyinside the firebox. The top wall 29 of the delivery spout curvesupwardly and forwardly and terminates in the firing opening. It isprovided with a flange 30 which forms therewith a recess to receive thefiredoor 3|. The firedoor 3! is attached 0 to the backhead in the usualmanner and closes the upper portion of the firing opening. The bottomwall 32 of the delivery spout is inclined upwardly toward the firingopening rearward of the backhead and curves forwardly and downwardly inthe firebox.

Positioned in the firebox and rigidly secured by studs 33 to the bottomwall of the discharge spout is a distributor table 34. The distributortable 3 is slightly discharge end of elevating screw. The distributortable 3G is provided with an upward extension 31 at the rear thereof andintegral therewith, carrying chambers or pasag-es 35. The passages 35have a double row of transverse nozzles 36 in com- 55 below theelevation of the 43 by bolts 44.

munication therewith. The nozzles 36 are drilled in the upward extension31 in such a manner that the blast discharged from the nozzles will befan shaped. The nozzles 36 and distributor table 34 are both forward ofthe inside sheet 20 of the backhead and below the lower marginal edge ofthe firing opening. The passages 35 extend transversely at the front ofthe discharge spout, longitudinally at the sidesof the bottom wall 32and through the firing opening to the rear of the backhead where theyare in communication with pipe lines 33. Pipe lines 38 communicate witha source of fluid pressure in the well known manner, and suitable valves(not shown) are employed in the pipe lines to vary the pressure of theblasts issuing from the nozzles. Although the nozzles 36 and thetransverse portion of the passages 35 are shown in the upward integralextension 31 of the distributor table, the passages and nozzles may belocated. entirely in the bottom wall 32 of the delivery spout ifdesired. The bottom wall 32 of the-delivery spout is spacedfrom thelower margin 28 of the firing opening sufficiently to provide apassageway to permit relatively cold air to be drawn through the firingopening to cool the stoker parts exposed to the heat.

The delivery spout is preferably rectangular in cross-sectional shape,the width thereof being substantially the same as the width of the risersection 24, and the cross-sectional area thereof greater than thecross-sectional area of the upper portion of the riser section 25. Bynot flaring the conduit 23 adjacent the backhead, a narrower firingopening can be provided than the present conventional hand andstokerfiring opening used with riser conduits that flare outwardly at theirupper end, and fuel is prevented from packing in the spout 25 because ofits increased crosssectional area.

To facilitate entrance into the firebox for repairing, etc., the topportion livery spout ismade separate, and detachably secured tothe lowerportion of the spout by studs 40. To facilitate trimming the fire, theflow of fuel to the distributor table is governed by hinged vanes 41,one of which is positioned on each side of the outlet end of thedelivery spout. The vanes 4| are manually adjusted by means of handwheels 42.

Provided on each side of the spout is an outward and forwardly extendingflange 43. An angle iron 35 is attached to each of the flanges The angleirons 55 are rigidly secured to the backhead on each side of the lowerportion of the firing opening by studs 45. Thus, the weight of theforward end of the conduit is vertically supported upon the backhead.The holes 46 in the flanges 43, through which the bolts 44 project, arepreferably oval shaped or slotted to provide clearance for the bolts tomove therein. When a train of cars surges upon the locomotive frame,causing it to spring slightly upwardly or downward, as occurs when thelocomotive stops suddenly, relative movement of the conduit 23 with thebackhead will be facilitated by this joint. The angle irons are notrigidly secured to the flanges 43. The bolts 44 are tightened to anextent whereby they will hold the conduit 23 in position, but stillallow slight relative movement of the conduit with the angle irons, whenthere are stresses upon the conduit or locomotive parts.

The rear end of the conduit 23 is vertically supported upon thelocomotive frame by a plate 39 of the de- 41. The plate 41 is secured atits upper end to ribs 48, one of which is on each side of the conduit,by bolts 49; and secured to a transverse web 50 on the rear of thelocomotive frame by bolts 5|. The plate is of sufficient flexibility 5to allow longitudinal movement of the conduit with relation to thelocomotive frame when the backhead expands from the heat in the firebox.The forward end 52 of the transfer conduit of the Stoker is flexiblyconnected to the conduit 10 23 by a ball joint clamp 53. A tie bar 54rigidly secures the rear end of the conduit 23 to the mudring of theboiler and should there be any strains upon. the conduit 23, caused bylongitudinal movement of the transfer conduit when 15 starting andstopping the locomotive, they will be directly imposed upon the mudring,and such stresses will not cause distortion of the backhead sheets.

In operation, fuel is conveyed to the lower 20 end of the riser section24 through a transfer conduit extending beneath the deck of the tender.The fuel may be delivered to the riser section from a transfer conduitwhich is in end to end relation therewith, as shown, or it may pass into25 the riser section by gravity. The elevating screw 21 may bedrivenseparately at its lower end by adriveshaft, or by the conveying means inthe transfer conduit, as desired. The fuel is moved through therisersection 24 and the rear of the 30 the elevating screw 21, the fuel ofitself to the elevation of a horizontal plane through the highest pointof the bottom wall 32 of the spout. The fuel is then pushed forwardly arelatively short 35 distance to a point where it will fall onto thedistributor table 34, the path of the fuel from the screw to thedistributor table changing more than ninety degrees. By pushing the fuelforward to a point where it falls by gravity onto 40 the distributortable, instead of conveying it directly thereto, it is unnecessary tooffset the screw laterally to obtain even delivery of the fuel. Theangle of repose of fuel is approximately forty-five degrees, and byhaving the bottom wall of the spout curved downwardly inside thefirebox, the fuel will fall in loose form upon the distributor tablewithout coming in contact with the entire top wall of the spout. Thefuel is scattered to all areas of the firebed 50 as it falls into thepath of fluid blasts issuing from the nozzles 36. By making thecross-sectional area of the delivery spout greater, than that of theupper end of the riser section 24 the fuel is prevented from packing inthe spout.

What I claim is:- 1. In combination, a locomotive firebox having abackwall with a firing opening therein, a fuel feed conduit mountedexteriorly of the firebox arranged to deliver fuel into the lower 60portion of the firing opening and comprising a lower riser section andan upper spout section, said riser section being inclined upwardly andforwardly toward the backwall and said spout section extending upwardlyand forwardly from 55 the riser section to the lower portion of thefiring opening at an angle of inclination to the horizontal greater thanthe inclination of the riser section, said sections having bottom wallsmeeting at a point rearward of said backwall in a level below the firingopening, the bottom wall of said spout section extending upwardly andforwardly from said point to the lower marginal edge of the firingopening at the outer surface of the backwall and thence turning forscrewconveying the wardly into the firing opening wherein said botrisersection to the lower portion of the firing tom wall then slopesdownwardly toward the opening at an angle of inclination to thehoriinside of the firebox, distributing means at the zontal greater thanthe inclination of the riser end of said bottom wall within the fireboxinsection, said sections having bottom walls meetsubstantiallyequidistant throughout its length surface of the backwall and thenceturning forfrom said bottom wall of the spout, and a screw wardly intothe firing opening wherein said tion extending upwardly and forwardlyfrom the HENRY E. LIPPERT.

